Spine Length / Base Width

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B. trifoliolata

Spine Length & Base Width

by Bob Harms email-here

B. trifoliolata

B. swaseyi

B. swaseyi X trifoliolata
The spines of B. trifoliolata are significantly longer and thicker than those of B. swaseyi, with hybrid spines generally intermediate in size.

Averages
	Base Width (mm.)	Length (mm.)	n=
BETR	0.34	1.25	(60,76)
BESxT	0.24	0.89	(59,54)
BESW	0.21	0.75	(56,56)

Key: BETR = B. trifoliolata, BESW = B. swaseyi, BESxT = B. swaseyi X trifoliolata;
n = (no. of base measurements, no. of length measurements).

Ranges
	Base Width (mm.)		Length (mm.)
	Minimum	Maximum	Minimum	Maximum
BETR	0.25	0.59	0.5	3.5
BESxT	0.18	0.35	0.45	2.2
BESW	0.14	0.32	0.42	1.45